11989931 has 8 divisors (see below), whose sum is σ = 12774720. Its totient is φ = 11220552.

The previous prime is 11989927. The next prime is 11989951. The reversal of 11989931 is 13998911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11989931 - 2² = 11989927 is a prime.

It is a super-2 number, since 2×11989931² = 287516890769522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11989951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2225 + ... + 5378.

It is an arithmetic number, because the mean of its divisors is an integer number (1596840).

Almost surely, 2^11989931 is an apocalyptic number.

11989931 is a deficient number, since it is larger than the sum of its proper divisors (784789).

11989931 is an equidigital number, since it uses as much as digits as its factorization.

11989931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7705.

The product of its digits is 17496, while the sum is 41.

The square root of 11989931 is about 3462.6479751774. The cubic root of 11989931 is about 228.8787965495.

The spelling of 11989931 in words is "eleven million, nine hundred eighty-nine thousand, nine hundred thirty-one".